DestinationUnreachable incorrectly assumed to come from target host

[fujiapple852]

Trippy currently assumes that ICMP DestinationUnreachable errors are from the target host, as can be seen from line 758 in the code below:

trippy/crates/trippy-core/src/strategy.rs

Lines 742 to 761 in c5b9de0

	/// Mark the `ProbeState` at `sequence` completed as `Unreachable` and update the round
	/// state.
	#[instrument(skip(self))]
	pub fn complete_probe_unreachable(
	&mut self,
	sequence: Sequence,
	host: IpAddr,
	received: SystemTime,
	icmp_code: IcmpPacketCode,
	extensions: Option<Extensions>,
	) {
	self.complete_probe(
	sequence,
	IcmpPacketType::Unreachable(icmp_code),
	host,
	received,
	true,
	extensions,
	);
	}

[c-git]

This also interacts with not crashing on errors from #1238 because all nodes along the path get resolved to the local machine's host name. I should add this is still a preferred behaviour over crashing.